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APPLICATION ROV
Remotely Operated Vehicles (ROV) are state-of-the-art and precisely controllable underwa-
ter robots that are often operated in shifts from a vessel by an operator. They descend to
great depths, where they carry out repairs and manipulations on oil platforms, pipelines,
etc. Pressure-compensated valves are used for positioning the ROV and for the complex
motion sequences of the manipulation arms.
FUNCTION
The ROV is controlled from the mother vessel via connecting
cables. The entire hydraulics is located on the ROV and is
designed for high pressures at great depths. It is equipped
with special, pressure-compensated valves for this purpose.
The operator's control commands are transmitted as electri-
cal signals from the water surface to the ROV at a depth of
over 3000 m and converted by NG3-MINI valves into a pre-
cise movement of the manipulation arms in real time. The
manoeuvring and positioning of the robot is performed by
thrusters, whose hydraulic motors are driven and controlled
by large pressure valves with high volume flows.
COMPONENTS
The partly high volume flows for the thruster control are con-
trolled by large and powerful proportional pressure reducing
valves with a nominal volume flow of up to 250 l/min (nomi-
nal size M42). For the control of the manipulation arms, how-
ever, the small spool valves of the NG3-MINI series are suf-
ficient. These miniature hydraulic valves were developed as
pilot valves as well as for special applications such as ROVs
or sewer robot cameras and cover a niche in many areas
of modern mechanical engineering. The advantage of these
miniature valves is on the one hand their size and weight and
on the other hand their low electrical power consumption,
which is particularly important for remote-controlled or au-
tonomous systems.
SPECIALTIES
• Valves with pressure compensation
• Integrated on-board electronics
• Various connector variants or potted cables for easy installation
• Execution for water glycol as hydraulic fluid
WANDFLUH MARINE | APPLICATION | ROV | PAGE 5